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L K Reed

Publications and source records attributed to L K Reed.

3 recordsLinked to original sources
PubMed1998

Visual reproduction subtest of the Wechsler Memory Scale-Revised: analysis of construct validity.

This study assessed the construct validity of Visual Reproduction (VR) Cards A (Flags) and B (Boxes) from the original Wechsler Memory Scale (WMS) compared to Flags and Boxes from the revised edition of the WMS (WMS-R). Independent raters scored Flags and Boxes using both the original and revised scoring criteria and correlations were obtained with age, education, IQ, and four separate criterion memory measures. Results show that for Flags, there is a tendency for the revised scoring criteria to produce improved construct validity. For Boxes, however, there was a trend in the opposite direction, with the revised scoring criteria demonstrating worse construct validity. Factor analysis suggests that Flags are a more distinct measure of visual memory, whereas Boxes are more complex and significantly associated with conceptual reasoning abilities. Using the revised scoring criteria, Boxes were found to be more strongly related to IQ than Flags. This difference was not found using the original scoring criteria.

Adult↗
PubMed1998

An integrated multipurpose lesion-making electrode.

PURPOSE: Although excellent results are reported from centers using microelectrode mapping during stereotactic pallidotomy, the recording methods used are time-consuming and technically cumbersome. We sought to develop a new electrode concept that may, when eventually applied in clinical practice, improve the efficiency and safety of microelectrode-guided functional neurosurgical procedures. CONCEPT: The scout electrode uses a recently developed research technique for simultaneously obtaining multiple microelectrode recordings along the shaft of a macroelectrode. RATIONALE: By positioning recording sites on either side of a lesion-making contact, it is possible to functionally "scout" the brain tissue surrounding the proposed lesion site, thus eliminating the need for serial movements and electrode interchanges. DISCUSSION: The feasibility of the scout electrode concept was tested using prototypes placed into cat medial geniculate nucleus. High-quality unit recordings were simultaneously obtained from different regions within the medial geniculate nucleus. This ability to physiologically map sites above and below the lesion-making contact facilitated precise placement of radiofrequency lesions in the center of the medial geniculate nucleus. These results suggest that it may be possible to develop clinically useful devices based on this novel concept.

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